component
LTC2851IS8#TRPBF
Public Made by Adomby adom
Analog Devices RS-485/RS-422 ICs, SO-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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LTC2851IS8#TRPBF
Analog Devices · RS-485/RS-422 ICs · SO-8
LTC2851IS8#TRPBF from Analog Devices, in a SO-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VCC | power_in | Positive supply, 3V ≤ VCC ≤ 3.6V, bypass with a 0.1µF ceramic capacitor. |
| 2 | RO | output | Receiver output: high when A > B by 200mV, low when A < B by 200mV, and high if the receiver inputs are open, shorted or terminated without a valid signal. |
| 3 | DI | input | Driver input: a high forces Y high and Z low, a low forces Y low and Z high; the LTC2851 has no driver enable so the driver is always enabled. |
| 4 | GND | power_in | Ground. |
| 5 | Y | output | Noninverting driver output, high impedance when the driver is disabled or unpowered. |
| 6 | Z | output | Inverting driver output, high impedance when the driver is disabled or unpowered. |
| 7 | B | input | Inverting receiver input, with impedance >96kΩ in receive mode or unpowered. |
| 8 | A | input | Noninverting receiver input, with impedance >96kΩ in receive mode or unpowered. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | SO-8 |
| Category | Interface ICs |
| Pins | 8 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Differential Driver Output Voltage (R = ∞, VCC = 3V) | /VOD/ | 1.5 | V | R = ∞, VCC = 3V (Figure 1); VCC-level max printed as VCC | 4 | ||
| Differential Driver Output Voltage (R = 27Ω, VCC = 3V) | /VOD/ | 2 | V | R = 27Ω, VCC = 3V (Figure 1); VCC-level max printed as VCC | 4 | ||
| Difference in Magnitude of Driver Differential Output Voltage | Δ/VOD/ | 0.2 | V | R = 27Ω or 50Ω (Figure 1) | 4 | ||
| Driver Common Mode Output Voltage | VOC | 3 | V | R = 27Ω or 50Ω (Figure 1) | 4 | ||
| Difference in Magnitude of Driver Common Mode Output Voltage | Δ/VOC/ | 0.2 | V | R = 27Ω or 50Ω (Figure 1) | 4 | ||
| Maximum Driver Short-Circuit Current | IOSD | -250 | 180 | 250 | mA | -7V ≤ (Y or Z) ≤ 12V (Figure 2) | 4 |
| Receiver Input Current (A, B), VIN = 12V | IIN | 125 | µA | DE = TE = 0V, VCC = 0V or 3.3V, VIN = 12V (Figure 3) (C, I-Grade) | 4 | ||
| Receiver Input Current (A, B), VIN = -7V | IIN | -100 | µA | DE = TE = 0V, VCC = 0V or 3.3V, VIN = -7V (Figure 3) (C, I-Grade) | 4 | ||
| Receiver Input Resistance | RIN | 96 | 125 | kΩ | RE = VCC or 0V, DE = TE = 0V, VIN = -7V, -3V, 3V, 7V, 12V (Figure 3) (C, I-Grade) | 4 | |
| Receiver Differential Input Threshold Voltage | VTH | -0.2 | 0.2 | V | -7V ≤ B ≤ 12V | 4 | |
| Receiver Output High Voltage | VOH | 2.4 | V | I(RO) = -4mA, A-B = 200mV, VCC = 3V | 4 | ||
| Receiver Output Low Voltage | VOL | 0.4 | V | I(RO) = 4mA, A-B = -200mV, VCC = 3V | 4 | ||
| Receiver Short-Circuit Current | IOSR | -85 | 85 | mA | 0V ≤ RO ≤ VCC | 4 | |
| Logic Input High Voltage | VIH | 2 | V | VCC = 3.6V | 4 | ||
| Logic Input Low Voltage | VIL | 0.8 | V | VCC = 3V | 4 | ||
| Logic Input Current | IINL | -10 | 0 | 10 | µA | 4 | |
| Maximum Data Rate | fMAX | 20 | Mbps | 5 | |||
| Driver Input to Output Propagation Delay | tPLHD, tPHLD | 10 | 50 | ns | RDIFF = 54Ω, CL = 100pF (Figure 4) | 5 | |
| Driver Input to Output Difference | ΔtPD | 1 | 6 | ns | RDIFF = 54Ω, CL = 100pF (Figure 4) | 5 | |
| Driver Output Y to Output Z Skew | tSKEWD | -6 | 1 | 6 | ns | RDIFF = 54Ω, CL = 100pF (Figure 4) | 5 |
| Driver Rise or Fall Time | tRD, tFD | 4 | 12.5 | ns | RDIFF = 54Ω, CL = 100pF (Figure 4) | 5 | |
| Receiver Input to Output Propagation Delay | tPLHR, tPHLR | 50 | 70 | ns | CL = 15pF, VCM = 1.5V, /VAB/ = 1.5V, tR and tF < 4ns (Figure 6) | 5 | |
| Differential Receiver Skew | tSKEWR | 1 | 6 | ns | CL = 15pF (Figure 6) | 5 | |
| Receiver Output Rise or Fall Time | tRR, tFR | 3 | 12.5 | ns | CL = 15pF (Figure 6) | 5 | |
| Supply Current with Both Driver and Receiver Enabled | ICCTR | 450 | 1000 | µA | No Load, DE = VCC, RE = 0V | 5 | |
| Supply Voltage (recommended) | VCC | 3 | 3.6 | V | 9 | ||
| Operating Temperature Range (LTC285xI) | TA | -40 | 85 | °C | Industrial grade (I) | 2 | |
| Supply Voltage (absolute maximum) | VCC | -0.3 | 7 | V | 2 | ||
| Logic Input Voltages (DI) | -0.3 | 7 | V | Pins RE, DE, DI; only DI applies to LTC2851 | 2 | ||
| Interface I/O Voltage (A, B, Y, Z) | 15 | V | Minimum printed as (VCC, 15V) | 2 | |||
| Receiver Output Voltage (RO) | RO | -0.3 | V | Maximum printed as (VCC + 0.3V) | 2 | ||
| Storage Temperature Range | TSTG | -65 | 150 | °C | 2 | ||
| Maximum Junction Temperature | TJMAX | 150 | °C | S8 package | 2 | ||
| Thermal Resistance, Junction to Ambient (S8) | θJA | 150 | °C/W | S8 package (8-lead plastic SO) | 2 | ||
| Thermal Resistance, Junction to Case (S8) | θJC | 39 | °C/W | S8 package (8-lead plastic SO) | 2 |
CAD (KiCad official)
- Symbol:
LTC2851IS8#TRPBF - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SO-8 (KiCad packages3D, STEP)
- 3D model files:
ltc2851is8-trpbf-etched.step/ltc2851is8-trpbf-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ltc2851is8-trpbf.step/ltc2851is8-trpbf.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Analog Devices datasheet (18 pp, sha256
68e25e1cc3687b9f, retrieved 2026-10-30, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).
# LTC2851IS8#TRPBF
**Analog Devices** · RS-485/RS-422 ICs · SO-8
LTC2851IS8#TRPBF from Analog Devices, in a SO-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
## Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VCC | power_in | Positive supply, 3V ≤ VCC ≤ 3.6V, bypass with a 0.1µF ceramic capacitor. |
| 2 | RO | output | Receiver output: high when A > B by 200mV, low when A < B by 200mV, and high if the receiver inputs are open, shorted or terminated without a valid signal. |
| 3 | DI | input | Driver input: a high forces Y high and Z low, a low forces Y low and Z high; the LTC2851 has no driver enable so the driver is always enabled. |
| 4 | GND | power_in | Ground. |
| 5 | Y | output | Noninverting driver output, high impedance when the driver is disabled or unpowered. |
| 6 | Z | output | Inverting driver output, high impedance when the driver is disabled or unpowered. |
| 7 | B | input | Inverting receiver input, with impedance >96kΩ in receive mode or unpowered. |
| 8 | A | input | Noninverting receiver input, with impedance >96kΩ in receive mode or unpowered. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | SO-8 |
| Category | Interface ICs |
| Pins | 8 |
## Electrical characteristics
Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Differential Driver Output Voltage (R = ∞, VCC = 3V) | /VOD/ | 1.5 | | | V | R = ∞, VCC = 3V (Figure 1); VCC-level max printed as VCC | 4 |
| Differential Driver Output Voltage (R = 27Ω, VCC = 3V) | /VOD/ | 2 | | | V | R = 27Ω, VCC = 3V (Figure 1); VCC-level max printed as VCC | 4 |
| Difference in Magnitude of Driver Differential Output Voltage | Δ/VOD/ | | | 0.2 | V | R = 27Ω or 50Ω (Figure 1) | 4 |
| Driver Common Mode Output Voltage | VOC | | | 3 | V | R = 27Ω or 50Ω (Figure 1) | 4 |
| Difference in Magnitude of Driver Common Mode Output Voltage | Δ/VOC/ | | | 0.2 | V | R = 27Ω or 50Ω (Figure 1) | 4 |
| Maximum Driver Short-Circuit Current | IOSD | -250 | 180 | 250 | mA | -7V ≤ (Y or Z) ≤ 12V (Figure 2) | 4 |
| Receiver Input Current (A, B), VIN = 12V | IIN | | | 125 | µA | DE = TE = 0V, VCC = 0V or 3.3V, VIN = 12V (Figure 3) (C, I-Grade) | 4 |
| Receiver Input Current (A, B), VIN = -7V | IIN | -100 | | | µA | DE = TE = 0V, VCC = 0V or 3.3V, VIN = -7V (Figure 3) (C, I-Grade) | 4 |
| Receiver Input Resistance | RIN | 96 | 125 | | kΩ | RE = VCC or 0V, DE = TE = 0V, VIN = -7V, -3V, 3V, 7V, 12V (Figure 3) (C, I-Grade) | 4 |
| Receiver Differential Input Threshold Voltage | VTH | -0.2 | | 0.2 | V | -7V ≤ B ≤ 12V | 4 |
| Receiver Output High Voltage | VOH | 2.4 | | | V | I(RO) = -4mA, A-B = 200mV, VCC = 3V | 4 |
| Receiver Output Low Voltage | VOL | | | 0.4 | V | I(RO) = 4mA, A-B = -200mV, VCC = 3V | 4 |
| Receiver Short-Circuit Current | IOSR | -85 | | 85 | mA | 0V ≤ RO ≤ VCC | 4 |
| Logic Input High Voltage | VIH | 2 | | | V | VCC = 3.6V | 4 |
| Logic Input Low Voltage | VIL | | | 0.8 | V | VCC = 3V | 4 |
| Logic Input Current | IINL | -10 | 0 | 10 | µA | | 4 |
| Maximum Data Rate | fMAX | 20 | | | Mbps | | 5 |
| Driver Input to Output Propagation Delay | tPLHD, tPHLD | | 10 | 50 | ns | RDIFF = 54Ω, CL = 100pF (Figure 4) | 5 |
| Driver Input to Output Difference | ΔtPD | | 1 | 6 | ns | RDIFF = 54Ω, CL = 100pF (Figure 4) | 5 |
| Driver Output Y to Output Z Skew | tSKEWD | -6 | 1 | 6 | ns | RDIFF = 54Ω, CL = 100pF (Figure 4) | 5 |
| Driver Rise or Fall Time | tRD, tFD | | 4 | 12.5 | ns | RDIFF = 54Ω, CL = 100pF (Figure 4) | 5 |
| Receiver Input to Output Propagation Delay | tPLHR, tPHLR | | 50 | 70 | ns | CL = 15pF, VCM = 1.5V, /VAB/ = 1.5V, tR and tF < 4ns (Figure 6) | 5 |
| Differential Receiver Skew | tSKEWR | | 1 | 6 | ns | CL = 15pF (Figure 6) | 5 |
| Receiver Output Rise or Fall Time | tRR, tFR | | 3 | 12.5 | ns | CL = 15pF (Figure 6) | 5 |
| Supply Current with Both Driver and Receiver Enabled | ICCTR | | 450 | 1000 | µA | No Load, DE = VCC, RE = 0V | 5 |
| Supply Voltage (recommended) | VCC | 3 | | 3.6 | V | | 9 |
| Operating Temperature Range (LTC285xI) | TA | -40 | | 85 | °C | Industrial grade (I) | 2 |
| Supply Voltage (absolute maximum) | VCC | -0.3 | | 7 | V | | 2 |
| Logic Input Voltages (DI) | | -0.3 | | 7 | V | Pins RE, DE, DI; only DI applies to LTC2851 | 2 |
| Interface I/O Voltage (A, B, Y, Z) | | | | 15 | V | Minimum printed as (VCC, 15V) | 2 |
| Receiver Output Voltage (RO) | RO | -0.3 | | | V | Maximum printed as (VCC + 0.3V) | 2 |
| Storage Temperature Range | TSTG | -65 | | 150 | °C | | 2 |
| Maximum Junction Temperature | TJMAX | | | 150 | °C | S8 package | 2 |
| Thermal Resistance, Junction to Ambient (S8) | θJA | | 150 | | °C/W | S8 package (8-lead plastic SO) | 2 |
| Thermal Resistance, Junction to Case (S8) | θJC | | 39 | | °C/W | S8 package (8-lead plastic SO) | 2 |
## CAD (KiCad official)
- Symbol: `LTC2851IS8#TRPBF`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SO-8 (KiCad packages3D, STEP)
- 3D model files: `ltc2851is8-trpbf-etched.step` / `ltc2851is8-trpbf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ltc2851is8-trpbf.step` / `ltc2851is8-trpbf.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Analog Devices datasheet](https://www.analog.com/media/en/technical-documentation/data-sheets/285012fe.pdf) (18 pp, sha256 `68e25e1cc3687b9f`, retrieved 2026-10-30, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).
[Datasheet PDF](docs/ltc2851is8-trpbf-datasheet.pdf)